Lab 1: Chi-Square Goodness-of-Fit Quiz
The question sheet
Reveal any answer as you study-
What will the student evaluate in this lab?
- If data fit chi-square or t
- If data fit normal or binomial
- If data fit Poisson or geometric
- If data fit uniform or exponential
Reveal answer
Answer: If data fit uniform or exponential
Source evidence
PDF page 653: • The student will evaluate data collected to determine if they fit either the uniform or exponential distributions.
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How many people should you ask for their grocery receipt totals?
- 20
- 10
- 50
- 30
Reveal answer
Answer: 30
Source evidence
PDF page 653: Go to your local supermarket. Ask 30 people as they leave for the total amount on their grocery receipts. (Or, ask three cashiers for the last ten amounts. Be sure to include the express lane, if it is open.) NOTE You may need to combine two categories so that each cell has an expected value of at least five.
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As an alternative to asking 30 people, you may ask three cashiers for:
- The last ten amounts
- The store's total
- The busiest hour
- The average sale
Reveal answer
Answer: The last ten amounts
Source evidence
PDF page 653: Go to your local supermarket. Ask 30 people as they leave for the total amount on their grocery receipts. (Or, ask three cashiers for the last ten amounts. Be sure to include the express lane, if it is open.) NOTE You may need to combine two categories so that each cell has an expected value of at least five.
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When collecting data, you are told to be sure to include the:
- Express lane if open
- Self-checkout
- Pharmacy line
- Deli counter
Reveal answer
Answer: Express lane if open
Source evidence
PDF page 653: Go to your local supermarket. Ask 30 people as they leave for the total amount on their grocery receipts. (Or, ask three cashiers for the last ten amounts. Be sure to include the express lane, if it is open.) NOTE You may need to combine two categories so that each cell has an expected value of at least five.
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You may need to combine two categories so each cell has an expected value of at least:
- Two
- Thirty
- Ten
- Five
Reveal answer
Answer: Five
Source evidence
PDF page 653: Go to your local supermarket. Ask 30 people as they leave for the total amount on their grocery receipts. (Or, ask three cashiers for the last ten amounts. Be sure to include the express lane, if it is open.) NOTE You may need to combine two categories so that each cell has an expected value of at least five.
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For the uniform distribution test, which percentile values are requested?
- 25, 50, 75
- 33, 66
- 20, 40, 60, 80
- 10, 30, 50, 70, 90
Reveal answer
Answer: 20, 40, 60, 80
Source evidence
PDF page 654: b. 20 percentile = _________
PDF page 654: c. 40 percentile = _________
PDF page 654: d. 60 percentile = _________
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For the exponential distribution test, part d asks for the:
- Mode
- Range
- Median
- Mean
Reveal answer
Answer: Median
Source evidence
PDF page 655: d. median = ________
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The first test in the lab checks if grocery receipts follow which distribution?
- Normal
- Binomial
- Exponential
- Uniform
Reveal answer
Answer: Uniform
Source evidence
PDF page 654: Test to see if grocery receipts follow the uniform distribution.
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One test checks if receipts follow the exponential distribution using what parameter?
- Standard deviation
- Correlation
- Growth rate
- Decay parameter
Reveal answer
Answer: Decay parameter
Source evidence
PDF page 655: 1 Test to see if grocery receipts follow the exponential distribution with decay parameter . ̄
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For the exponential test, the random variable is written as:
- X ~ Exp( )
- X ~ U( )
- X ~ N( )
- X ~ B( )
Reveal answer
Answer: X ~ Exp( )
Source evidence
PDF page 655: as the decay parameter, X ~ Exp(_________).
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For the exponential distribution data, part b asks for the:
- Median
- First quartile
- Lowest value
- Highest value
Reveal answer
Answer: First quartile
Source evidence
PDF page 655: b. first quartile = ________
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Which percentile is requested for the exponential test in part c?
- 20 percentile
- 37 percentile
- 63 percentile
- 80 percentile
Reveal answer
Answer: 37 percentile
Source evidence
PDF page 655: c. 37 percentile = ________
Introductory Statistics
Introductory Statistics by OpenStax, used under CC BY 4.0. Changes made by Stratacademy.
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